CN111094855B

CN111094855B - Thermally activated building panel

Info

Publication number: CN111094855B
Application number: CN201780092678.9A
Authority: CN
Inventors: 耶斯佩尔·尼尔森; 朱利安·道格拉斯·泰伊德斯雷·里梅; 西尔维奥·泰西耶; 瓦西利奥斯·安德烈亚斯·奥利弗; 刘恒; 特洛伊·希克斯; 塔米·拉穆勒; 肖恩·乔丹
Original assignee: Price Industries Ltd; Kvadrat Soft Cells AS
Current assignee: Price Industries Ltd; Kvadrat Soft Cells AS
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2021-06-04
Anticipated expiration: 2037-06-28
Also published as: WO2019002915A1; JP6929394B2; SG11201912928YA; ES2882697T3; CA3067670A1; US20200115897A1; CN111094855A; EP3645946A1; PL3645946T3; JP2020528991A; EP3645946B1; US11649630B2; DK3645946T3

Abstract

A heat activated building panel (1) comprises a metal sheet (2) having a room-facing surface (3) and a building-facing surface (4). The heat exchanger tubes (5) for conveying a cooling or heating medium are in heat-conducting contact with the building-facing surface (4) of the metal sheet (2). The fabric (9) is arranged on the room-facing surface (3) of the metal sheet (2) and has a first surface (10) substantially contacting the metal sheet (2) and a second surface (11) substantially visible from the room. The fabric (9) is tensioned between the opposite edges (12) of the metal sheet (2). The first surface (10) of the fabric (9) is metallized by depositing metal particles on the fabric (9).

Description

Thermally activated building panel

Technical Field

The invention relates to a heat-activated building panel which is adapted to be mounted at a ceiling or a wall of a room and comprises a metal sheet having a room-facing surface and a building-facing surface, wherein a heat exchanger tube for conveying a cooling medium or a heating medium is in heat-conducting contact with the building-facing surface of the metal sheet, and wherein a fabric is arranged on the room-facing surface of the metal sheet, which fabric has a first surface substantially contacting the metal sheet and a second surface substantially visible from said room.

Background

EP 0299909 a1 discloses a thermal ceiling consisting of metal sheets and a support structure carrying flexible tubes through which a heating or cooling medium flows to reach a desired room temperature. The tubes are mat-shaped and are placed loosely and directly on the metal sheet. A plurality of circular perforations for the passage of sound are formed in the metal plate and a sound-absorbing layer in the form of a mat is placed directly on the metal plate or on the flexible pipe. Improved sound insulation can also be achieved by applying a sound-absorbing microporous layer, which does not substantially obstruct the passage of air, to the bottom face of the metal sheet provided with the pierced through-holes. However, the thermal conductivity between the acoustic microporous layer and the metal plate may be relatively low, and thus applying the acoustic microporous layer may reduce the efficiency of the thermal ceiling. Further, since the sound absorbing microporous layer abuts the surface of the metal plate, it may be difficult or even impossible to avoid that the edges of the circular perforations in the metal plate affect the surface of the sound absorbing microporous layer so that the circular perforations can be seen through the sound absorbing microporous layer. In addition, since light is transmitted through the sound absorbing microporous layer to some extent, the transmitted light will be reflected back by the metal plate and pass through the sound absorbing microporous layer. However, the light will be reflected in a different way at the circular perforations in the metal plate, and for this reason the circular perforations will also be visible through the sound-absorbing microporous layer. As a result, the aesthetic appearance of the thermal ceiling may be adversely affected.

DE 4335654 a1 discloses a foil fastened to the upper surface of the ceiling of a room, which comprises perforated metal panels. The sheet reduces the acoustic damping only to a small extent and significantly improves the fire resistance of the ceiling of a room. If the sheet is not fastened directly near the perforations in the metal panel or is slightly expanded or elongated in the area of the perforations, the acoustic damping is not actually reduced. The elongation may be obtained by driving with a foam roller on a glued sheet, whereby the sheet is slightly pressed into the holes and thus plastically stretched. The foam roll can then also be moved over the underside of the metal panel, if necessary, so that the sheet is pushed up again, but the elongation is maintained. A plastic tube with a heating or cooling medium running through it may extend over the sheet. Thus, the sheet also acts as a screen (screen) for the plastic tube. The plastic tubes may be assembled in the mat or separately positioned. They are attached to the film by a thermally conductive adhesive, and the adhesive between the film and the metal plate is preferably also thermally conductive, so that a good heat transfer between the plastic tube and the metal plate occurs. For this reason, the foil also has good thermal conductivity and is also opaque, so that the plastic tube cannot be seen through the hole. Aluminum meets these requirements. In order to obtain better heat radiation from the ceiling, the bottom surface of the foil is provided with a coloured coating. However, for aesthetic reasons, it may be disadvantageous that the perforated metal panel is freely exposed so that the perforations are visible.

DE 202005010524U 1 discloses a flat-surface panel for a suspended ceiling, comprising a honeycomb composite panel, which on the room-facing side has a perforated cover layer. The surface plate may have the form of a thermal panel. Due to the perforated cover layer facing the room, a particularly high sound absorption capacity of the thermal panel can be achieved. To further increase the sound absorption capacity, the room-facing side of the perforated cover layer of the honeycomb composite panel may additionally be provided with acoustic fluff and/or an open-pored coating (e.g. an open-pored plaster layer or a paint layer or an open-pored mineral coating). However, as mentioned above, this type of surface plate may have the following disadvantages: the thermal conductivity between the acoustic fluff or the like and the perforated cover layer may be relatively low and it may be difficult or even impossible to avoid that the perforations of the cover layer can be seen through the acoustic fluff or the like.

GB 796,138 discloses a method of metallizing textiles, in particular textiles made from cellulose fibres, by exposing the textile material to a vapour of the metal in a high vacuum and then heating the textile material at a temperature in excess of 100 degrees celsius, thereby achieving metallization of the textile material.

EP 0452558 a1 discloses a planar heat exchange element, in particular for cooling a chamber, which is composed of a metal plate facing the chamber and in which flow channels for conducting a heat exchange medium are integrated. The fabric material may cover the side of the metal plate facing the chamber.

US 2013/0122769 a1 discloses a composite sheet comprising a substrate and a multi-layer coating on its outer surface, the coating comprising a metal layer and an outer polymer layer formed from a precursor comprising a polymerizable composition containing olefinic groups and moisture-curing groups, such as isocyanate or silane groups. The function of the polymer layer includes protecting the metal layer from corrosion. The composite sheet is useful in various building structures, but the composite sheet is particularly useful in roofing and wall systems. The highly reflective metallized surface of the composite sheet provides a low emissivity surface that enhances the performance of the insulation and increases the energy efficiency of wall and roof systems, thereby reducing the energy costs of building owners. The composite sheet is preferably installed in a wall or roof system such that the metallized side is adjacent to the air space. The high moisture vapor permeability of the composite sheet allows water vapor to pass through the composite sheet, thereby spreading it in the air space, thereby preventing moisture condensation in the insulation.

DE 1951130 discloses a metal-coated web of plastic or synthetic material.

Disclosure of Invention

It is an object of the present invention to provide a heat-activated building panel which is thermally efficient and at the same time has a smooth and uniform fabric surface, while perforations are not visible through the fabric.

For this purpose, the fabric is tensioned between opposite edges of the metal sheet and the first surface of the fabric is metallized by depositing metal particles on the fabric.

By depositing the metal particles on the fabric, the thermally conductive metal coating can be integrated into the entire structure of the first surface of the fabric, thereby greatly increasing the thermal conductivity between the fabric and the metal plate. By tensioning the fabric between the opposite edges of the metal plate and blocking light transmission through the fabric by means of a metal coating integrally incorporated into the first surface of the fabric, the fabric surface can be uniformly arranged and perforations in the metal plate can be effectively prevented from being visible through the fabric.

In one embodiment, the first surface of the fabric is metallized by vacuum deposition of metal particles onto the fabric. Thus, the material to be evaporated may be a solid in any form and purity. The vacuum coating will generally only contain elements or molecules deliberately introduced into the deposition chamber, thereby ensuring high quality and reproducibility of the coating.

In one embodiment, the first surface of the fabric is metallized by depositing metal particles onto the fabric in the form of ion plating. Thus, a higher density and stronger adhesion of the coating can be achieved compared to vacuum deposition.

In one embodiment, the first surface of the fabric is metallized by depositing metal particles in the form of an electroplating on the fabric. Thus, a thick, hard and heavy coating can be obtained.

In one embodiment, the first surface of the fabric is metallized by depositing metal particles in the form of electroless plating on the fabric. Thus, the absence of an electric field may contribute to a uniform thickness of the coating compared to electroplating.

In one embodiment, the metal particles deposited on the fabric are formed primarily or entirely of aluminum. Accordingly, a relatively high thermal conductivity of the metal coating deposited on the first surface of the fabric may be ensured, whereby the thermal conductivity between the fabric and the metal plate may be maximized. Furthermore, since aluminum is one of the most reflective metals in the world, blocking the transmission of light through the fabric can be achieved very effectively by means of the metal coating, thereby preventing the perforations in the metal plate from being visible through the fabric even better.

In one embodiment, the metal particles deposited on the fabric form a metal coating that is integrally incorporated into the structure of the first surface of the fabric. In particular, the thermal conductivity of the metal coating deposited on the first surface of the textile can thus be increased even further, since the heat can be transferred even better into or out of the internal structure of the textile.

In one embodiment, the metal particles deposited on the fabric form a metal coating having a maximum thickness of substantially less than 1000 microns, preferably less than 750 microns, more preferably less than 500 microns, even more preferably less than 250 microns, even more preferably less than 150 microns, even more preferably less than 50 microns, and most preferably less than 25 microns.

In one embodiment, the metal particles deposited on the fabric form a metal coating having a minimum thickness of substantially greater than 500 nm, preferably greater than 750 nm, and most preferably greater than 1000 nm.

In one embodiment, the metal particles deposited on the fabric form a metal coating, the weight per square meter of the metal coating is less than 300 mg, the weight per square meter of the metal coating is preferably less than 200 mg, the weight per square meter of the metal coating is more preferably less than 100 mg, the weight per square meter of the metal coating is even more preferably less than 50 mg, the weight per square meter of the metal coating is even more preferably less than 30 mg, the weight per square meter of the metal coating is even more preferably less than 10 mg, and the weight per square meter of the metal coating is most preferably less than 5 mg.

In one embodiment, the metal particles deposited on the fabric form a metal coating having a weight per square meter of greater than 100 micrograms, preferably greater than 200 micrograms, and most preferably greater than 300 micrograms.

In one embodiment, the metal plate is arranged within a frame consisting of profile elements, each profile element having a circular outer edge connecting the room-facing side of the profile element with the building-facing side of the profile element, the fabric being bent around the circular outer edge of the profile element, and the edge of the fabric being elastically fixed to the building-facing side of the profile element, preferably by means of at least one spring element. Thus, the tension of the fabric between the opposite edges of the metal sheet can be optimized, whereby the perforations in the metal sheet can be prevented even better from being visible through the fabric. Furthermore, the metal plate may be completely hidden within the fabric when viewed from the room side.

In a structurally particularly advantageous embodiment, each edge of the fabric is provided with a bracket which is arranged in a track in the side of the corresponding profile element facing the building and which is spring-biased to one side in the track, so that the fabric 9 is tensioned between the opposite edges of the metal sheets. Thus, the tensioning of the fabric between the opposite edges of the metal sheet can be even further optimized, whereby the perforations in the metal sheet can be even better prevented from being visible through the fabric.

In a structurally particularly advantageous embodiment, each edge of the metal sheet is arranged in the recess of the corresponding profile element such that the room-facing surface of the metal sheet is flush with a portion of the room-facing side of the profile element, which portion forms a smooth transition with the rounded outer edge of the profile element.

In one embodiment, none of the profile elements extends through the plane of the room-facing surface of the metal sheet. Hereby, it may be ensured that the fabric abuts the metal plate evenly, whereby an even smoother, substantially room-facing second surface of the fabric may be ensured.

In one embodiment, the metal plate is perforated to allow sound waves to pass from the room into the rear sound absorbing panel.

In one embodiment, the metal plate is deformed into a three-dimensional bow that forms a greater than the natural sag of the tensioned fabric to ensure contact between the plate and the fabric. Thus, an even smoother, generally room-facing second surface of the fabric may be ensured.

In one embodiment, the metal sheet is formed into a three-dimensional configuration (profile) such that when the fabric is tensioned, the metal sheet guides the fabric into the designed shape.

In one embodiment, the second surface of the fabric is at least substantially free of metal particles. By keeping the second surface of the fabric, which generally faces the room, at least substantially free of metal particles, it is also possible to increase or optimize the heat radiation between the fabric and the room, and furthermore, there may be a sufficient choice between different fabric surface structures and colors.

Drawings

The invention will now be explained in more detail hereinafter by way of examples of embodiments with reference to the very schematic drawings in which:

FIG. 1 is a cross-sectional view through a portion of an embodiment of a thermally activated building panel according to the present invention;

FIG. 2 is a perspective view from above of a portion of the heat activated building panel of FIG. 1;

FIG. 3 is an exploded view of a portion of the heat-activated building panel of FIG. 1;

FIG. 4 is an exploded view of a portion of the profile member of the heat-activated building panel of FIG. 1;

FIG. 5 is a perspective cross-sectional view of a portion of the profile member of the heat activated building panel of FIG. 1; and

fig. 6 shows comparative test results demonstrating the thermal performance of a thermally activated building panel according to the present invention.

Detailed Description

Fig. 1 and 2 show a part of an embodiment of a thermally activated building panel 1 according to the invention. The heat-activated building panel 1 is adapted to be mounted at a ceiling or a wall of a room, not shown, to provide primarily radiant heating or cooling of the room. The heat activated building panel 1 comprises a metal sheet 2 having a room facing surface 3 and a building facing surface 4. Heat exchanger tubes 5 for conveying a cooling or heating medium are in heat-conducting contact with the building-facing surface 4 of the metal sheet 2 in order to control the temperature of the metal sheet 2, which can then exchange heat with the surroundings in the room by convection and mainly radiation. The heat exchanger tubes 5 are mounted on the building-facing surface 4 of the metal plate 2 by means of heat-conducting brackets 6. The heat-conducting bracket 6 has a flat portion 7, the underside of which is mounted directly flat on the building-facing surface 4 of the metal plate 2. Furthermore, the heat-conducting bracket 6 has a part-circular portion 8 which is integrally joined to the upper side of the flat portion 7 and has an upper opening for inserting the heat exchanger tube 5 which is tightly fitted in the part-circular portion 8. Thus, an efficient heat conducting contact is provided between the heat exchanger tubes 5 and the metal plate 2.

The fabric 9 is arranged on the room-facing surface 3 of the metal sheet 2 and has a first surface 10 substantially contacting the metal sheet 2 and a second surface 11 substantially visible from the room. The fabric 9 is tensioned between the opposite edges 12 of the metal sheet 2. In order to provide an efficient thermal conductivity between the fabric 9 and the metal plate 2, the first surface 10 of the fabric 9 is metallized by depositing metal particles on the fabric. Furthermore, in one embodiment, in order to ensure effective heat radiation between the fabric 9 and the room, the second surface 11 of the fabric 9 is at least substantially free of metal particles. It is also possible to provide a sufficient choice between different fabric surface structures and colors.

In order to provide acoustic attenuation in a room, in the embodiment shown in the figures, several perforations 26 are arranged in the metal sheet 2 for sound to enter from the room-facing surface 3 of the metal sheet 2 to the building-facing surface 4 of the metal sheet 2. The perforated metal plate 2 may allow sound waves to pass from the room into a not shown rear sound-absorbing panel. The number, size and shape of these perforations 26, as well as the volume of the cavity above the building-facing surface 4 of the metal sheet 2 and the possible presence of damping material, not shown, within said cavity and the acoustic properties of the damping material, not shown, within said cavity may influence the acoustic attenuation properties of the heat-activated building panel 1. Furthermore, the acoustic attenuation properties may be influenced by a suitable choice of the structure of the fabric 9 and an acoustic attenuation of the sound waves impinging on the room-facing surface 3 of the metal sheet 2, in particular at higher frequencies, which are well known per se, may thereby be achieved.

Preferably, the first surface 10 of the fabric 9 is metallized by vacuum deposition of metal particles onto the fabric 9, however different coating methods such as spraying may also be used.

The vacuum coating will at least substantially contain only the elements or molecules intended to be introduced in the deposition chamber where the metal particles are vacuum deposited on the fabric 9, thus ensuring high quality and reproducibility of the coating.

Vacuum deposition is also known as vacuum metallization and is a process by which material from a thermal evaporation source reaches the fabric 9 without colliding with gas molecules in the space between the source and the fabric 9. It can be done by evaporating the metal material with heat and condensing the metal vapor on the fabric surface under partial or full vacuum. By using vacuum deposition, the material to be evaporated can be a solid of any form and purity. In contrast, it is noted that although by fabric metallization, metal particles are deposited on the fabric surface, thereby forming a metal coated fabric, on the other hand, by what is commonly referred to as metal application, metallic materials such as wire, foil, sheet metal are directly attached to the fabric to achieve a glittering effect. By the fabric metallization, the basic fabric material, such as for example the appearance, is retained. As mentioned above, according to the present invention, the fabric 9 is metallized by vacuum depositing metal particles on the fabric 9.

Alternatively, the first surface 10 of the fabric 9 is metallized by ion plating metal particles on the fabric 9. Ion plating is a physical vapor deposition technique whereby a metal coating is produced by adhering evaporated metal particles to a fabric. The fabric to be coated is placed in an inert gas with the metallic material by applying heat and a low speed electric arc to evaporate the molecules of the metallic material. The metal coating is produced by bombarding accelerated ionized metal particles onto the surface of the fabric. This technique may have higher density and stronger adhesion than vacuum deposition.

Alternatively, the first surface 10 of the fabric 9 is metallized by electroplating (also called electrodeposition) of metal particles on the fabric 9. By means of electroplating, the electrically conductive textile material is coated with a layer of metal particles by means of an electric current. A thick, hard and heavy metal coating may be produced on the fabric. The electroplating process is performed in an electrolytic cell comprising an electrolyte and two electrodes. The anode (positive electrolyte) is formed of the coating metal, while the cathode (negative electrolyte) is the part to be coated.

Alternatively, the first surface 10 of the fabric 9 is metallized by electroless plating of metal particles on the fabric 9.

Preferably, the metal particles deposited on the fabric 9 are formed mainly of aluminum or entirely of aluminum. Accordingly, a relatively high thermal conductivity of the metal coating deposited on the first surface 10 of the fabric 9 can be ensured, whereby the thermal conduction between the fabric 9 and the metal plate 2 can be maximized. Furthermore, since aluminum is one of the most reflective metals in the world, blocking the transmission of light through the fabric 9 can be achieved very effectively by means of a metal coating, thereby preventing the perforations 26 in the metal plate 2 from being visible through the fabric 9 even better.

Preferably, the metal particles deposited on the fabric 9 form a metal coating which is integrated into the structure of the first surface 10 of the fabric 9. Thereby, in particular, the thermal conductivity of the metal coating deposited on the first surface 10 of the fabric 9 can be even further enhanced, since the heat can be transferred even better into or out of the internal structure of the fabric 9.

In one embodiment, the metal particles deposited on the fabric 9 form a metal coating having a maximum thickness of substantially less than 1000 microns, preferably less than 750 microns, more preferably less than 500 microns, even more preferably less than 250 microns, even more preferably less than 150 microns, even more preferably less than 50 microns, and most preferably less than 25 microns.

In one embodiment, the metal particles deposited on the fabric 9 form a metal coating having a minimum thickness of substantially more than 500 nm, preferably more than 750 nm, and most preferably more than 1000 nm.

In one embodiment, the metal particles deposited on the fabric 9 form a metal coating having a weight per square meter of less than 300 milligrams, preferably less than 200 milligrams, more preferably less than 100 milligrams, even more preferably less than 50 milligrams, even more preferably less than 30 milligrams, even more preferably less than 10 milligrams, and most preferably less than 5 milligrams.

In one embodiment, the metal particles deposited on the fabric 9 form a metal coating having a weight per square meter of greater than 100 micrograms, preferably greater than 200 micrograms, and most preferably greater than 300 micrograms.

As shown partly in fig. 1 and 2, the metal sheet 2 is arranged in a frame 13 consisting of profile members 14. Each profile element 14 has a circular outer edge 15 which connects a room-facing side 16 of the profile element 14 with a building-facing side 17 of the profile element 14. The fabric 9 is bent around the circular outer edge 15 of the profile element 14 and the edge 18 of the fabric 9 is elastically fixed to the building-facing side 17 of the profile element 14 by means of at least one spring element 19. Each edge 18 of the fabric 9 is provided with a bracket 20, which bracket 20 is arranged in a track 21 in the building-facing side 17 of the corresponding profile element 14, and which bracket 20 is spring-biased to one side in the track 21 by means of at least one spring element 19, so that the fabric 9 is tensioned between the opposite edges 12 of the metal sheet 2. The spring member 19 has the form of an elongate flexible hoop. As shown, the edge 18 of the fabric 9 is secured in a longitudinally extending serrated track 30 in the holder 20, wherein a retaining member 22 in the form of a spring is pressed into the serrated track 30, thereby pressing the fabric edge 18 against the serrated wall of the serrated track 30.

As shown, each edge 12 of the metal sheet 2 is arranged in the recess 23 of the corresponding profiled element 14 such that the room-facing surface 3 of the metal sheet 2 is flush with a portion 24 of the room-facing side 16 of said profiled element 14. The portion 24 forms a smooth transition with the rounded outer edge 15 of the profiled element 14. Furthermore, it is to be noted that none of the profile members 14 extends through the plane of the room-facing surface 3 of the metal sheet 2, i.e. said portion 24 which is flush with the metal sheet 2 extends as a continuation of the room-facing surface 3 of the metal sheet 2 until said portion 24 extends to the rounded outer edge 15 integrally joined therewith. Thus, it can be ensured that the fabric 9 abuts the metal plate 2 evenly, whereby an even smoother, substantially room-facing second surface 11 of the fabric 9 can be ensured.

The frame 13 consisting of the profile members 14 can be arranged on and around the central element 27 of the heat activated building panel 1, wherein each profile member 14 has an upper mounting flange 28 which grips on the top surface of said central element 27 and an inner wall 29 which abuts the side of said central element 27.

The frame 13 consisting of the profile elements 14 can be mounted at the ceiling or wall of a room, not shown, by means of suitable, not shown, mounting brackets mounted on said ceiling or wall and engaging the mounting rails 25 (shown in fig. 1) of the respective profile elements 14.

The fabric 9 tensioned between the opposite edges 12 of the metal sheet 2 may be a non-woven or woven fabric in the form of a flexible material formed of natural or synthetic fibers, yarns or threads. The fabric 9 is preferably a material or structure that allows air to diffuse therethrough.

In one embodiment, the metal sheet 2 is deformed into a three-dimensional bow that forms a greater than the natural sag of the tensioned fabric to ensure contact between the sheet 2 and the fabric 9.

In one embodiment, the metal sheet 2 is formed into a three-dimensional configuration such that when the fabric 9 is tensioned, the metal sheet 2 guides the fabric into a designed shape

Comparing the test results

Fig. 6 graphically illustrates the relative thermal performance of a heat-activated building panel according to the present invention compared to a prior art panel without fabric and a panel with uncoated fabric, respectively.

The X-axis of the graph represents the difference between the indoor air temperature and the average temperature of the water circulating through the heat exchanger tubes of the thermally activated building panels. The Y-axis of the graph represents relative performance in percent.

The measured relative performance of the prior art heat activated building panel without any fabric covering the metal sheets was set to 100% as shown by curve 31 in fig. 6. Further, curve 32 represents the measured relative performance of a heat activated building panel in which the metal sheet is covered by a tensioned fabric, which is not coated with any metal. It can be seen that the relative performance of the latter panel substantially decreases to between 65% and 67% of the relative performance of the prior art heat activated building panel without any fabric. Finally, curve 33 represents the measured relative performance of the heat-activated building panel according to the invention, wherein the metal sheet is covered by a tensioned fabric, wherein the first surface 10 of the fabric 9 substantially contacting the metal sheet is metallized by depositing aluminum particles on the fabric 9, and wherein the second surface 11 of the fabric 9 substantially visible from the room is at least substantially free of metal particles. It can be seen that the relative performance of the heat-activated building panels according to the invention only slightly decreases to 91% to 100% of the relative performance of the prior art heat-activated building panels without any fabric. In summary, comparative test results show that it is possible to provide a heat-activated building panel according to the invention having a smooth and uniform fabric surface and still achieving efficient thermal performance. Another result of the comparative test, not shown in fig. 6, is that the perforations 26 in the metal panel 2 of the heat-activated building panel according to the invention are not visible through the fabric 9, whereas for the tested heat-activated building panel in which the metal panel is covered by a tensioned fabric that is not coated with any metal, the perforations are indeed visible through the fabric. It is noted that there is no difference between the two different heat-activated building panels, represented by

curves

32, 33 respectively, other than the metallization of the fabric.

Reference numerals

1 thermally activated building panel

2 Metal plate

3 Room-facing surface of Metal sheet

4 building-facing surface of metal sheet

5 Heat exchanger tube

6 heat conduction support

7 flat part of thermally conductive holder

8 partially circular part of thermally conductive holder

9 Fabric

10 first surface of the fabric

11 second surface of the fabric

12 opposite edges of the metal sheet

13 frame

14 section bar component

15 rounded outer edge of profile member

Room facing side of 16 profile member

17 facing the building side of the profiled element

18 edges of the fabric

19 spring component

20 support

21 track

22 holding member

23 recess

24 part of the room-facing side of the profile element

Mounting rail of 25 section bar component

26 perforation in metal sheet

27 center element of heat activated building panel

28 mounting flange of section bar member

29 inner wall of section bar component

30 rack saw tooth-shaped rail

31 relative performance of prior art panels without fabric

32 relative performance of panels with uncoated fabric

33 relative properties of the panel according to the invention with a fabric coated with metal.

Claims

1. A heat-activated building panel (1), which heat-activated building panel (1) is adapted to be mounted at a ceiling or a wall of a room, and which heat-activated building panel comprises a metal plate (2) having a room-facing surface (3) and a building-facing surface (4), wherein a heat exchanger tube (5) for conveying a cooling medium or a heating medium is in heat-conducting contact with the building-facing surface (4) of the metal plate (2), and wherein a fabric (9) is arranged on the room-facing surface (3) of the metal plate (2), which fabric (9) has a first surface (10) substantially contacting the metal plate (2) and a second surface (11) substantially visible from the room, characterized in that the fabric (9) is tensioned between opposite edges (12) of the metal plate (2), and wherein the first surface (10) of the fabric (9) is metallized by depositing metal particles on the fabric (9).

2. The thermally activated building panel as claimed in claim 1, wherein the first surface (10) of the fabric (9) is metallized by depositing metal particles on the fabric (9) in the form of vacuum deposition, ion plating, electroplating or electroless plating.

3. The thermally activated building panel as claimed in claim 1 or 2, wherein the first surface (10) of the fabric (9) is metallized by vacuum deposition of metal particles on the fabric (9).

4. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) are formed mainly of aluminium or are formed entirely of aluminium.

5. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating which is integrated into the structure of the first surface (10) of the fabric (9).

6. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating, the maximum thickness of which is substantially less than 1000 microns.

7. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating, the minimum thickness of which is substantially greater than 500 nanometers.

8. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of less than 300 mg.

9. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of more than 100 micrograms.

10. Thermally activated building panel according to claim 1, wherein the metal sheet (2) is arranged within a frame (13) of profile members (14), wherein each profile member (14) has a circular outer edge (15) connecting a room-facing side (16) of the profile member (14) with a building-facing side (17) of the profile member (14), wherein the fabric (9) is bent around the circular outer edge (15) of the profile member (14).

11. The heat-activated building panel as claimed in claim 10, wherein each edge (18) of the fabric (9) is provided with a bracket (20), which bracket (20) is arranged within a track (21) in the building-facing side (17) of the corresponding profile member (14), and wherein the bracket (20) is spring-biased to one side in the track (21) so as to tension the fabric (9) between the opposite edges (12) of the metal sheet (2).

12. The heat-activated building panel according to claim 10 or 11, wherein each edge (12) of the metal sheet (2) is arranged in a recess (23) of the corresponding profile member (14) such that the room-facing surface (3) of the metal sheet (2) is flush with a portion (24) of the room-facing side (16) of the profile member (14), which portion (24) forms a smooth transition with the rounded outer edge (15) of the profile member (14).

13. The heat-activated building panel as claimed in claim 12, wherein none of the profile members (14) extends through the plane of the room-facing surface (3) of the metal sheet (2).

14. The thermally activated building panel as claimed in claim 1, wherein the metal sheet (2) is perforated to allow sound waves to pass from the room into the sound absorbing panel behind the metal sheet (2).

15. The heat-activated building panel as claimed in claim 1, wherein the second surface (11) of the fabric (9) is at least substantially free of metal particles.

16. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a maximum thickness of less than 750 microns.

17. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a maximum thickness of less than 500 microns.

18. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a maximum thickness of less than 250 microns.

19. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating, the maximum thickness of which is less than 150 microns.

20. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a maximum thickness of less than 50 microns.

21. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a maximum thickness of less than 25 microns.

22. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating, the minimum thickness of which is greater than 750 nm.

23. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating, the minimum thickness of which is greater than 1000 nanometers.

24. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of less than 200 mg.

25. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of less than 100 mg.

26. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of less than 50 mg.

27. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of less than 30 mg.

28. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of less than 10 mg.

29. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of less than 5 mg.

30. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of more than 200 micrograms.

31. The thermally activated building panel as claimed in claim 1, wherein the metal particles deposited on the fabric (9) form a metal coating having a weight per square meter of more than 300 micrograms.

32. The heat-activated building panel as claimed in claim 10, wherein an edge (18) of the fabric (9) is elastically fixed to the building-facing side (17) of the profiled element (14) by at least one spring element (19).